The rethermalization unit is basically made up of numerous cells that are used to heat different foods at specific temperatures. This means that the user can actually heat food in one compartment, preserve frozen food in another compartment and warm food on a different cell within the same unit. The cells are separated from each other by a double glazed wall hence zero heat transmission from cell to cell. The number of compartments on a unit depends on its size and specific use. For instance, a large unit can have as many as 70 compartments while a small size contains as few as 10 cells.
The rethermalization unit offers the best when it comes to conservation and preservation of heat. It can hardly allow heat into or out of the system. Its walls are made of thick fiberglass that acts as a perfect insulator. Some units have fiberglass as thick as 4 inches. Standard types have 2-inch-thick walls. The door to the unit is made of double insulated material that ensures zero heat loss from the system. The door has an automatic latching system that uses magnetic technology. It remains closed whenever the unit is not in use.
Heating of foods inside the rethermalization unit is done using a dual heating mechanism. The heating system incorporates a fan and a heater. The heater supplies the system with heat while the fan circulates heat evenly throughout the cell. The most recent models are compatible with various computer operating systems. The computer can control as many as 30 units efficiently without incurring any technical problems. Computerized control of the units has made rethermalization simpler, faster, efficient and accurate. Various types of software are being developed to give the user a better experience and an easier time controlling the heating units.